What Breed(s) is My Puppy?

We recently adopted a puppy and are curious to know what breed(s) she is. She is 12 weeks old and weighs 10 lbs. Height at the shoulder is 13.5 inches. She seems to be learning very quickly and she has occasionally howled while in her crate the first week. We were told she is a Fox Terrier mix, but her coloring doesn't seem to be typical of a Fox Terrier.

She has very long legs and can jump quite high. Her mother was 1 year old and was also a Fox Terrier mix with the same coloring. She weighed about 15-20 lbs. We know nothing about the father.

By Amanda F.